==== run-tcpbench6-3-1 ====
rm -f nc.log
nc -6 -v -l -V 41 fc00:0:0:1::41 12345 >/dev/null 2>nc.log &
# Wait until nc is listening.
for  i in `jot 30`; do if fgrep -q Listening nc.log; then break; fi; sleep .1; done
fgrep Listening nc.log
Listening on fc00:0:0:1::41 12345
# Test that path MTU dicovery is working.
tcpbench -6 -t 5 -V 43 -b fc00::43 fc00:0:0:1::41
  elapsed_ms          bytes         mbps   bwidth 
        1000      196557592     1572.461  100.00% 
Conn:   1 Mbps:     1572.461 Peak Mbps:     1572.461 Avg Mbps:     1572.461
        2000      277685152     2221.481  100.00% 
Conn:   1 Mbps:     2221.481 Peak Mbps:     2221.481 Avg Mbps:     2221.481
        3000      219167408     1753.339  100.00% 
Conn:   1 Mbps:     1753.339 Peak Mbps:     2221.481 Avg Mbps:     1753.339
        4000      180212408     1441.699  100.00% 
Conn:   1 Mbps:     1441.699 Peak Mbps:     2221.481 Avg Mbps:     1441.699
        5003      197329248     1575.483  100.00% 
Conn:   1 Mbps:     1575.483 Peak Mbps:     2221.481 Avg Mbps:     1575.483
--- fc00:0:0:1::41 tcpbench statistics ---
1273150872 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1441.699/1712.893/2221.481/272.927 Mbps
# path MTU discovery in other rtable does not work in ip6_output()
/sbin/route -T 43 -n get -host -inet6 fc00:0:0:1::41
   route to: fc00:0:0:1::41
destination: fc00::
       mask: ffff:ffff:ffff::
    gateway: ::1
  interface: lo43
 if address: ::1
   priority: 8 (static)
      flags: <UP,GATEWAY,DONE,STATIC>
     use       mtu    expire
      40     32768         0 
DISABLED